The legal uncertainty surrounding the virtual currency may be spooking Apple

Apple on Wednesday removed Blockchain, the last remaining application in its mobile store for transmitting bitcoins, signaling the continuing uncertainty around the virtual currency.

U.K.-based Blockchain wrote Thursday on its website that Apple told it the application, which is a "wallet" that can be used to store and send bitcoins, was removed due to an "unresolved issue." Blockchain said it received no prior warning of a problem.